block: use an on-stack bio in blkdev_issue_flush
There is no point in allocating memory for a synchronous flush. Signed-off-by:Christoph Hellwig <hch@lst.de> Reviewed-by:
Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by:
Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Acked-by:
Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
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